What is the difference between Audi's quattro and ultra quattro systems?

I am exploring the features of Audi cars and I would like to know more about their quattro and ultra quattro systems. Can someone explain the technical differences between these two systems and which one is better in terms of performance and efficiency?

The main difference between Audi's quattro and ultra quattro systems is their design and application. The traditional quattro system uses a mechanical center differential to distribute power to all four wheels, while the ultra quattro system uses an electronically controlled multi-plate clutch to shift power between the front and rear axles. In terms of performance, the traditional quattro system is better suited for off-road and extreme weather conditions, while the ultra quattro system is more efficient and responsive on smooth roads.

The quattro and ultra quattro systems differ in their technology and purpose. Audi's quattro system utilizes a planetary gearset to distribute power between the front and rear axles, while the ultra quattro system uses an integrated electro-hydraulic system to control power distribution. Both systems offer enhanced traction and handling, but the ultra quattro system is more advanced and efficient.

Audi's quattro and ultra quattro systems have similar outcomes, but their mechanisms are different. The quattro system employs a mechanical center differential and a rear-brake torque vectoring system, while the ultra quattro system uses torque vectoring via the rear axle, without a mechanical link. The best system for you will depend on your driving needs and preferences.